Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

3 ( 1 )

2019 ( 23 )

2018 ( 30 )

2017 ( 26 )

Custom range...

Search Results: 1 - 10 of 22529 matches for " Roberto Garnica "
All listed articles are free for downloading (OA Articles)
Page 1 /22529
Display every page Item
Analysis of Pseudoreplicants to Evaluate Natural Regeneration after Applying Prescribed Burns in a Temperate Forest of Mexico  [PDF]
José Germán Flore Garnica
Open Journal of Forestry (OJF) , 2012, DOI: 10.4236/ojf.2012.21002
Abstract: Although fire is one of the most important disturbing factors of forest in Mexico, little it is known on the effects of fire on the particular Mexican forest ecosystems. This is remarked for the fact that the effects of fires on vegetation vary among different types of forests. This lack of knowledge has constrained the use of fire, as a silvicultural tool. Therefore, the purpose of this project was to evaluate the effects of fire on regeneration, under burns. This work was carried out in a pine forest stand at Tapalpa Saw in Jalisco State, Mexico, dominated by Pinus michoacana and Pinus oocarpa. The study evaluated the effects of two techniques of prescribed burning: 1) backing, and 2) head fire. The sample plots were burned on 25 and 26 March 1991, before the rain season. One month before and 2 years after burning several measurements were made in order to evaluate the effect of fire on regeneration. Due to the limitations to work with “real” replicates (for treatments an control), original sample units (20 × 30 m) were divided into 5 × 5 m smaller sample units, which were considered as pseudoreplicants. Therefore, such analysis did not avoid introducing systematic error (bias) and minimize random error. Nevertheless, the variability within the pseudoreplicants was considerable in order to assume certain significance of the resulting estimations. Therefore, despite that this was a nonreplicated study; the results suggest strong ecological evidence that prescribed fire enhance natural regeneration of Pinus michoacana and Pinus oocarpa. In general, it is concluded that prescribed burning could be a valuable forest management tool in regions with similar conditions to the study area, in order to improve regeneration. However, further research is needed before prescribed fires can be applied with confidence in many Mexican forest conditions.
Spatial Distribution of Fuel Models Based on the Conditional-Fuel-Loading Concept  [PDF]
José Germán Flores Garnica
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.92009
Abstract: Fuel model mapping has followed in general two trends: 1) indirect inferences, where some factors, presumably associated with fuel production, are related to a given fuel model; and 2) experts consulting, which has been used to classify and to validate other people classifications. However, reliance on expert judgment implies a subjective approach. Thus, I propone the integration of geostatistic techniques and the Conditional-Fuels-Loading concept (CFL) to define a more objective perspective in the fuel-model mapping. The information used in this study was collected in a forest of Chihuahua, Mexico, where fuels were inventoried in 554 (1000 m2) sample plots. These sample plots were classified using the CFL; and ordinary kriging (Gaussian, spherical and exponential) was used to interpolate the fuel-model values. Using the Akaike’s Information Criterion the spherical model performed best. The methodology allowed a finer definition of spatial distribution of fuel models. Some advantages of the CFL are: 1) it is based on actual fuel loads, and not only on vegetation structure and composition; 2) it is objective and avoids the bias of different classifiers (experts); and 3) it avoids the need of the advice of experts.
Structure and Density Analysis of a Semi Desert Ecosystem Disturbed by Fire  [PDF]
José Germán Flores Garnica
Open Journal of Forestry (OJF) , 2018, DOI: 10.4236/ojf.2018.82011
Abstract: In Mexico, forest ecosystems are disturbed by fires and generally these are considered to have negative impacts. However, it is important to consider that fire is an element of these ecosystems, and is important for its functionality. So it should be understood that in many cases the effects of a forest fire are beneficial, which can be determined through studies of population dynamics of these ecosystems. However, most of these studies currently focused only on aspects of species composition, with few cases concerning the analysis of the structure and density. In this study, a comparative analysis of the vegetation showed that conditions prevailing between burned and unburned areas of a site covered by microphyll desert species (shrubs and mesquite). The results suggest that the structure and density conditions of vegetation between burned and unburned areas are not statistically different. This is highlighted because one year after the fire occurred there is no evidence that fire had altered the structure and density of vegetation. Moreover, both in burned and unburned areas, vegetation had a healthy condition. Finally, although this may suggests that the fire was of low intensity, which resulted in a low impact on vegetation, in future studies it is recommended to determine if the same results are observed under different possible fire behavior and intensity.
Explicación Funcionalista vs. Explicación Intencional en Ciencias Sociales Una mirada al trabajo Jon Elster
Garnica Nelson
Revista Colombiana de Sociología , 2001,
Abstract: Uno de los temas de lo que podría llamarse las diversas problemáticas que abordaJon Elster, es su fulminante ataque, que desde la filosofia de las ciencias sociales, le aplica a la utilización de la explicación funcionalista en dichas ciencias acompa ando dicha crítica con sus trabajos sobre la acción humana intencional y su defensa del individualismo metodológico como estrategia teorizadora adecuada para las ciencias sociales.
H y M: franquicia madrile a
Garnica, Julio
DC PAPERS : Revista de Crítica y Teoría de la Arquitectura , 2010,
Memórias de uma Escola Isolada Rural: estudo de um Livro de Visitas (1928-1948)
Garnica, Antonio Vicente Marafioti;
Educa??o & Sociedade , 2011, DOI: 10.1590/S0101-73302011000100005
Abstract: the so called "livro de visitas" is a book in which schools inspectors register some general perspectives when visiting a public school, writing down remarks on the schooling process as, for instance, the results of annual examinations and comments on the school, teachers and students. this paper studies the "livro de visitas" of the rural school "fazenda ponte alta/bela vista", in bariri, state of s?o paulo. based on the records of twenty years of activity (1928-1948), some educational elements are highlighted: the demands of the inspectors at that time, how such requirements were (or not) referred by teachers or the community. this allows to sketch a socio-historical scenario focusing on the practices that took place in a school that taught literacy and primary arithmetic. as a result, one can understand that the discourse of equal opportunities between rural and urban schools, so intensely proclaimed by politicians, was not complemented by efforts to guarantee equality of means.
Escolas, professores e caipiras: exercício para um descentramento histórico
Garnica, Antonio Vicente Marafioti;
Educa??o e Pesquisa , 2005, DOI: 10.1590/S1517-97022005000100009
Abstract: with the purpose of drawing a historical picture of the education and action of teachers in the state of s?o paulo countryside, this article sketches what we have called a "rustic" (mathematical) education, making use of an adjective already in use in sociology. the term 'decentering', borrowed from hall (2004), is used here to intensify a feature of the present study, namely, its intention of freeing itself from the more usual approaches, both in the history of education and in the history of mathematical education, which take as their point of departure the big centers and 'classical' institutes of education (for instance, the faculties of philosophy), neglecting a plurality of aspects that, we believe, are essential to understand more widely and globally certain educational practices. to realize such intention we start from a characterization of the rural education system, and then situate the movement of expansion of the secondary education, whose apex takes place in the 1950s with the construction of schools and the need to train teachers to work in them. although the region around bauru (sp) is the focus here, it can be seen that the understanding emerged here can characterize other contexts. finally, we discuss the nova alta paulista, a region of more recent occupation, thereby configuring a movement of exchange between the state's older regions on one side, with their well-established institutions, and the 'new' regions on the other, allowing a glimpse of a kind of extended concept of colonization, now applied to the educational context.
Um ensaio sobre as concep??es de professores de Matemática: possibilidades metodológicas e um exercício de pesquisa
Garnica, Antonio Vicente Marafioti;
Educa??o e Pesquisa , 2008, DOI: 10.1590/S1517-97022008000300006
Abstract: this article has as its main theme the conceptions held by mathematics teachers. by understanding the term "conception" on the basis of peirce's pragmatism, a set of methodological parameters are produced - denominated "indirect method" - to be applied in the study of mathematics teachers' conceptions. in summary, we want to investigate teachers' conceptions asking them not about their beliefs, but about their practices. after presenting the foundations of this indirect approach, and of making explicit its qualitative nature, the study proceeds to exemplify it with an exercise of this "indirect method", a study about the criteria used by teachers to select textbooks for their classes, thereby dealing with the conceptions of mathematics and of its teaching and learning that such criteria disclose. based on testimonies of mathematics teachers, the study suggests that teachers act with some independence when they choose the materials to be used in their classes. at the same time, they draw from a wide range of textbooks, disregarding the specificities of each work and the approaches and perspectives espoused by their authors. although they submit to textbooks - regarded as a legitimate and reliable source - teachers subvert them, trying to making them adequate to what they consider correct. from this observation, some of the teachers' conceptions can be highlighted: the pupil is usually evaluated and classified according to their deficiencies with respect to the contents. from this position follows the high value placed upon the logical precedence of the contents, their linear presentation, and the defense of "prerequisites" that would make teaching possible and, consequently, imply the legitimacy of predominantly expository classes.
O escrito e o oral: uma discuss?o inicial sobre os métodos da História
Garnica, Antonio Vicente Marafioti;
Ciência & Educa??o (Bauru) , 1998, DOI: 10.1590/S1516-73131998000100004
Abstract: the article tries to discuss the methods used by history, presenting arguments which advocate to the legitimacy of the use of oral sources, against the hegemony of the called "primary sources". it argues on the mistake to judge the written sources as more selectives or less tendencious than the oral ones, justifying as fundamental to the sciences of education this new approach to the history.
Cluster del Salmón en Chile: análisis de los factores de competitividad a escala internacional
Vera Garnica,José;
Revista Venezolana de Gerencia , 2009,
Abstract: this study aims to identify and analyze the central factors that determine the international competitiveness of the salmon cluster in chile. the methodology used is descriptive, contrasting theoretical approaches raised by porter in ?determining the competitive advantage of nations? and ?external economies and joint action? developed by schmitz. results state that factors consisting of natural conditions, low labor costs and the presence of specialized educational centers play an important role in cluster competitiveness. with regard to ancillary and related sectors, the network of suppliers and technology has enhanced its efficiency. the cluster structure has been boosted with the arrival of foreign capital, strengthening innovation and technology transfer. as for collective efficiency, the result of external economies and joint action is determined by a strong network of partnerships. the salmon cluster chile is a case where elements to strengthen its competitiveness in international markets are the product of particular conditions regarding the territory and the ability to produce action.
Page 1 /22529
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.